AUSTRALIAN GLACIATIONS 221 
composed of schists—in which many rock basins have been exca- 
vated varying in size from small tarns up to lakes several miles 
in extent. 
Dunn and Moore found roches moutonnées and striated surfaces 
on the flanks and almost to the very summits of Mounts Tyndall 
(3,875 feet), Sedgwick (4,000 feet), Geikie (3,950 feet), and others. 
Lakes Dora, Margaret, Ruby, and Rolleston lie in the valleys 
surrounding these heights, in the line of the extinct glaciers, and 
owe their existence either to excavated rock basins, or to banks of 
moraine. Lake Rolleston is impounded by a terminal moraine 
which crosses the valley in a high bank, 150 feet above the present 
valley on its eastern end, and 250 feet at its western. Scattered, 
perched, and lineal erratics occupy positions on the hillsides up to 
300 feet above the level of the valley. The moraines are loosely 
and irregularly piled up, carrying stones of all sizes up to roo tons 
in weight, many of which have been found glaciated and striated. 
The direction of the striae on rock faces vary at different points. 
A main glacier was fed from the north and northwest of Lake 
Rolleston, and the ice found its way down the principal outlet by 
the King River Valley. Another line of ice-flow, mentioned by 
Moore, was down the eastern slopes of Mount Owen, by the 
Linda Valley, and these joined on the main glacier of the King 
Valley. The moraines and other indications of ice movements 
were traced down to levels only 400 feet above sea level. Moore 
estimates that the ice had a thickness up to at least 1,000 feet. 
The accuracy of Dunn’s and Moore’s observations in this field 
were fully confirmed by Professor J. W. Gregory, who, in the 
year I900, went over the ground and still further increased our 
knowledge of the subject by valuable and independent observa- 
tions. Gregory’s original observations were mainly confined to 
the district around Mount Owen (3,800 feet) and Mount Lyell 
(2,744 feet). This observer says that Mount Owen, on its northern 
face, is ‘‘strikingly glaciated,’’ and describes extensive moraines 
in the valley of the Linda as well as that of the King. The Gor- 
maston moraine, on the eastern side of Mount Lyell Mine (in the 
upper Linda), takes its name from the township which it carried 
on its surface. It is a mile long by half a mile wide, and attains 
